5-Substituted 3-(diethoxyphosphoryl)isoxazoles and -2-isoxazolines were synthesized regioselectively by 1,3-dipolar cycloaddition of (diethoxyphosphoryl)formonitrile oxide to monosubstituted alkynes and alkenes. By applying this methodology to an N-(tert-butoxycarbonyl)-substituted allylglycine methyl ester, we prepared the precursors of two diastereomeric 3-phosphono-2-isoxazolin-5-yl-substituted
通过(二乙氧基
磷酰基)甲腈氧化物与1-取代的
炔烃和烯烃的1,3-偶极环加成反应,可选择性地合成5-取代的3-(二乙氧基
磷酰基)
异恶唑和-2-
异恶唑啉。通过将此方法应用于N-(叔丁氧基羰基)-取代的烯丙基甘
氨酸甲酯,我们制备了两个非对映体3-膦酰基-2-
异恶唑啉-5-基取代的
氨基酸的前体,它们是有效的N
MDA受体拮抗剂的
生物等排体。 。 环加成-区域选择性-
膦酸酯-
异恶唑-杂环